Process of manufacturing complex hydrofluoric salt



it making directly from its so sult fromthe reactions,

fl ffloll an nucnuna, or nanoynn-nrnrn,

. nornayor zunrcu, swrrananann.

GERMANY, ASSTGNOR T ALBERT ETER- JPEOUJESS 0h MANUT'ACTURTNG COMPJLEXHYDROTLUORTG fiAlLT.

vIla hrag. original application filed July 2e, 19%, Serial No. 7%,545,and in Germany July so, letd- Divided. and this application filedJanuary 28, 1927. Serial No. 164,371.

This application is a division of my application Serial No. 727,545filed duly 22nd, 192d.

For the manufacture of,hydrofluo-sil icic h salts there are known onlyvery inconvenlent methods, which are not easily carried out onafmanufacturin scale with commercial success.- Generally hydrofluoricacid and hydrofluo-silicic acid have to be made first, so

10 that all the difliculties of the manufacture and handling of'hydrofluoric acid are brought into the manufacture of hydrofluosilicic.salts,

This invention comprises a new way of only hydrofluo-silicic salts,hydrofluoric compounds.

lit consists in treating a fluoric salt with silicon-tetr'a-fluoride inpresence of a decomposable salt of the base, which shall be combinedwith the hydrofluo-silicic acid.

With the complex salts of fluorine instead ofsilicon-fluoride thecorresponding fluorides of other complex forming elements are used.

For assisting the formation of these compounds the reaction is carriedout under pressure or under pressure and at high temperature. Volatilecompounds, which recan be separated by distillation. 4

Furthermore, the process can be carried out with, solid raw materials orwith so little solvent that a solution ofthe reagents and'of "at a thecompounds formed can not talze plate.

The complex hydrofluoric salts are thus obytained directly from thecomponents by the process.

(lo I ared with known methods of making, to hydrouo-silicic salts thisnew process has eat advantages. I

-;.The manufacture of the salts is completed inone operation, whereasheretofore the init manufacture of hydrofluoric acid'by dis a:tillatio'n .urati was necessary, with subsequent satof this acid withsilicic acid. The p cation-of the process results in a at saving of timeand of machinery.

cic salts, or complex hydrofluoric salts the may be stated. emanufacture of hydrofluo-silicie components not but also complex @oncegthe manufacture of hydrofluoture water,

salts according to the invention the, followmg equation takes plate 2+-Sometimes it is advantageous, to work in presence of an acid, the addedacid being only a contact substance and small amounts are sufficient.

An example for the manufacture of other complex hydrofluoric salts showsthe following equation ZNaCl 2BR Cal (hydrochloric acid) Qhlaldll @aCl(hydrochloric acid) reaction is shown by the last equation.-

Chlorides in the form of metalchlorides are favorable as a soluble saltcomponent in the reaction. But any other salt can be used, which isdecomposable under the conditions of the process by the other reactioncomponents.

Tn the manufacture of complex fluorides another way is to let thefluoride of the complex forming element and hydrofluoric acid react upona salt the corresponding base of which is to form partof the complexcompounds. The acid of this salt is then obtained as free acid.

The following equation is a type of thisreaction hIaUl-l-BF +HF=NaBTT+HGl The advantages of'this new process are/in this case not so com leteas may be, though I acid is obtained as y-product. Therefore specialways shall be shown, where a fluoride furnishes the fluorine for theoperation.

The following is an example for worlrin 2- I hgfluoride of calcium aremixed with 117 lrg. chloride of sodium adding to the minwhich has beenacidified with till llll

llll

llllll I an alkali earth metal fluoride with the fluoride of an elementof the group consisting of silicon and boron in the presence of a saltof the alkali metal whose complex hydrofluoric salt shall be produced.

2. Process of manufacturing complex hydrofluoric salt, which comprisesreacting on an insoluble metal fluoride with the fluoride of an elementof the group consisting of silicon and boron in the presence of a saltof the alkali metal whose complex hydrofluoric salt shall be produced.

3. Process of manufacturing complex hydrofluoric salt, which comprisesreacting on an insoluble metal fluoride with the fluoride of an elementof the group consisting of silicon and boron in the presence of thechloride of the alkali metal whose complex hydrofluoric salt shall beproduced.

4. Process of manufacturing complex hydrofluoric salt, which comprisesreacting on an insoluble fluoride with the fluoride of an element of thegroup consisting of silicon and boron in the presence of a salt of thealkali metal whose complex hydrofluoric salt shall be produced, in thepresence of a small amount of acid as contact substance.

boron and a salt of the alkali metal whose complex hydrofluoric saltshall be produced, under pressure higher than atmospheric pressure.

7. Process of manufacturing complex hydrofluoric salts by the reactionof a simple fluorine compound with the fluoride of an element of thegroup consistin of silicon and boron, and a salt of the alka i metalWhose complex hydrofluoric salt shall be produced, under pressure higherthan atmospheric pressure and at a temperature higher than atmospherictemperature. I 8. Process of manufacturing complex hydrofluoric salts byreacting on a simple fluorine compound with the fluoride of an elementof the group consisting of silicon and boron, and a salt of the alkalimetal whose complex hydrofluoric salt shall be produced, working inpresence of an amount of solvent insufficient for the solution of thereaction components.

In testimony whereof I afiix my signature.

DR. MAX BUCHNER

